Aston Martin DB 9 2010 Manual page 83

The control unit has a system LED to show the system status, and one
status LED per road wheel.
The control unit road wheel status LEDs are color coded to the
colored collars on the road wheel valves.
Each pressure monitoring device has a
color coded collar. Make sure that the
colored collars are installed correctly, i.e.
after new tires are installed.
Roadwheel
Front Right - Green
Front Left - Red
Rear Right - Blue
Rear Left - Yellow
At the start of each journey, with the ignition ON or with the engine
running, the low tire pressure warning symbol will come ON for
approximately five seconds and then go OFF.
The control unit LEDs (C (System
Status)) and D (Tire Status)) will flash
amber continuously. Once a speed of
6 mph (10 km/h) has been reached the
LEDs start to receive signals from the
pressure monitoring devices in the
road wheels. The system status LED
will change to steady green and the tire LEDs will extinguish one by
one.
The control unit stays ON until the vehicle has come to a halt and
the ignition is set to OFF.
Warnings
Warning: When a tire low pressure warning is detected
reduce vehicle speed to an appropriate safe level and stop at the
first safe and convenient place to inspect the tire(s).
If there is tire fault or a system fault a warning message will also
show in the message centre (right).
If stationary for 20 minutes or more (engine running or vehicle
key at position 'II') the tire pressure warning symbol will come ON
and 'Tire System Fault' will show in the message centre (right). If, after
moving off (allow three to four minutes driving (maximum 20
minutes)), the symbol and message do not clear then the system may
be at fault. Stop and check the system.
4.21